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// SPDX-License-Identifier: Apache-2.0
/**
* @module Aggregator/Html/Shell
* @description Render the full article HTML document with the shared
* site chrome — site header, language switcher, skip link, theme toggle,
* breadcrumb, JSON-LD `NewsArticle` + `BreadcrumbList`, and footer. The
* shell pulls localized labels from `constants/languages.js` and
* composes the chrome from `templates/section-builders.ts`, so
* localisation, a11y, and CSP stay consistent with the rest of the
* site.
*/
import { BASE_URL, BUILD_SHORT, MERMAID_VERSION } from '../../constants/config.js';
import { buildHeadFreshnessTags } from '../../constants/build-info-meta.js';
import {
ALL_LANGUAGES,
PAGE_TITLES,
SKIP_LINK_TEXTS,
ARTICLE_NAV_LABELS,
BACK_TO_NEWS_LABELS,
VIEW_SOURCE_MARKDOWN_LABELS,
FOOTER_SITEMAP_LABELS,
FOOTER_POLITICAL_INTELLIGENCE_LABELS,
PROGRESSIVE_DISCLOSURE_LABELS,
getLocalizedString,
getTextDirection,
} from '../../constants/languages.js';
import { buildOgLocaleTags } from '../../constants/og-locales.js';
import { ORG_SAME_AS, buildTwitterAttributionTags } from '../../constants/social-handles.js';
import type { LanguageCode } from '../../types/index.js';
import { escapeHTML } from '../../utils/file-utils.js';
import {
buildResponsiveIconLinks,
buildResponsiveSocialImageMeta,
buildSiteFooter,
buildSiteHeader,
buildPageBanner,
} from '../../templates/section-builders.js';
import { getPoliticalIntelligenceFilename } from '../../generators/political-intelligence.js';
import { getSitemapFilename } from '../../generators/sitemap/index.js';
import { buildRssAlternateLink } from '../../templates/sections/rss-discovery.js';
import {
truncateHeadline,
getTitleSeparator,
buildPageTitle,
getLocalizedArticleType,
getLocalizedArticleTypePlain,
} from './headline.js';
import { clampForBudget } from '../metadata/seo-budgets.js';
import {
getArticleFilename,
buildArticleHreflangLinks,
buildLanguageSwitcher,
} from './hreflang.js';
import { buildArticleToc, type ArticleTocEntry } from './toc.js';
import { blobUrl } from '../infra/github-urls.js';
import { applyReaderFriendlyTransform } from '../reader-friendly-transform.js';
import {
buildLayerReadingTimes,
buildProgressiveDisclosureBody,
type LayerReadingTimes,
} from '../progressive-disclosure.js';
export type { ArticleTocEntry } from './toc.js';
/** Publisher organization name used in JSON-LD, meta tags. */
export const PUBLISHER_NAME = 'Hack23 AB';
/** Site name used across meta tags and structured data. */
export const SITE_NAME = 'EU Parliament Monitor';
/** Inputs for {@link wrapArticleHtml}. */
export interface WrapArticleOptions {
/** Target language (used for `<html lang>`, meta, nav labels). */
readonly lang: LanguageCode;
/**
* Logical article slug (no lang suffix, no extension). Example:
* `2026-01-15-breaking`. Used to build the `<link rel="alternate">` set.
*/
readonly articleSlug: string;
/** Pre-rendered HTML body fragment (from `renderMarkdown`). */
readonly body: string;
/**
* Enable reader-friendly post-processing for rendered HTML body text.
* Defaults to `true` for public HTML output.
*/
readonly readerFriendly?: boolean;
/** Article title — shown in `<title>`, breadcrumb, OG/Twitter meta. */
readonly title: string;
/** Article description — shown in `<meta name="description">` and OG. */
readonly description: string;
/**
* Optional: longer (up to ~300 chars) editorial summary lifted from
* the language-specific executive brief BLUF. When provided, used
* for `og:description` and `twitter:description`; falls back to
* `description` when absent. Lets social-card previews show the
* full BLUF paragraph while the short `<meta description>` stays
* within Google's ~160-char snippet budget.
*/
readonly extendedDescription?: string;
/** SEO keywords — shown in `<meta name="keywords">`. */
readonly keywords?: readonly string[];
/** Canonical ISO date of the run (YYYY-MM-DD). */
readonly date: string;
/** Article type slug (e.g. `breaking`, `motions`). */
readonly articleType: string;
/**
* Optional: repo-relative path to the aggregated source Markdown file so
* readers can open the exact input the HTML was rendered from. Rendered
* as a sidebar link and in the `<link rel="alternate">` set.
*/
readonly sourceMarkdownRelPath?: string;
/**
* Optional: ordered list of top-level H2 sections emitted into the
* article body. Used to render the article-level table-of-contents
* sidebar. When omitted (or empty) the sidebar is not rendered.
*/
readonly toc?: readonly ArticleTocEntry[];
/**
* Optional: total number of articles available site-wide. When provided
* the shared site footer surfaces a `<p class="footer-stats">{n} articles
* available</p>` line that matches the `index.html` chrome; otherwise
* the line is omitted.
*/
readonly articleCount?: number;
/**
* Optional: URLs of source artifacts included in the aggregated article.
* Emitted as `isBasedOn` in the JSON-LD `NewsArticle` schema for provenance.
*/
readonly isBasedOn?: readonly string[];
/**
* Optional: real-world organizations (political groups, media outlets,
* institutions) named in the article's intelligence and media-framing
* artifacts. Emitted as JSON-LD `mentions` Organization entries to give
* search engines and AI overviews high-precision entity grounding.
* Currently only extractable from the English intelligence corpus; the
* same list is reused across every language variant because the entities
* are language-independent proper nouns.
*/
readonly mentions?: readonly string[];
/** Optional precomputed reading-time estimates per disclosure layer. */
readonly readingTimes?: LayerReadingTimes;
}
/**
* Per-surface SEO clamps for one article render. Each field is the
* exact string emitted into the corresponding HTML/JSON-LD surface,
* pre-clamped to the budget in
* `src/aggregator/metadata/seo-budgets.ts`.
*
* Extracted from {@link wrapArticleHtml} to keep that function's
* cognitive complexity within limits while still funnelling every
* SEO surface through a single source of truth.
*/
interface SeoClampedSurfaces {
readonly pageTitle: string;
readonly ogTitleClamped: string;
readonly twitterTitleClamped: string;
readonly metaDescriptionClamped: string;
readonly ogDescriptionClamped: string;
readonly twitterDescriptionClamped: string;
readonly imageAltClamped: string;
readonly jsonLdHeadline: string;
readonly alternativeHeadline?: string;
}
/**
* Trailing separator characters (whitespace + editorial punctuation) that
* may dangle after a `Published …` tail has been removed.
*/
const TRAILING_SEPARATOR_CHARS = new Set(['\u2014', '\u2013', '|', ':', ';', ',', '-']);
/**
* Linear-time trailing trim of whitespace and editorial separator
* punctuation. Avoids the polynomial backtracking that an unanchored
* `/[\s…]+$/` character-class quantifier exhibits on adversarial input.
*
* @param value - Text whose trailing separators should be removed
* @returns `value` without trailing whitespace/separator characters
*/
function trimTrailingSeparators(value: string): string {
let end = value.length;
while (end > 0) {
const ch = value.charAt(end - 1);
if (TRAILING_SEPARATOR_CHARS.has(ch) || /\s/u.test(ch)) {
end -= 1;
} else {
break;
}
}
return value.slice(0, end);
}
/**
* Anchored `Published YYYY-MM-DD` tail matcher. The leading `Published`
* literal keeps the match deterministic (no ambiguous leading-whitespace
* quantifier), so it is linear on uncontrolled input.
*/
const PUBLISHED_DATE_TAIL_RE = /Published\s+\d{4}-\d{2}-\d{2}\.?\s*$/iu;
/**
* Remove leaked `Published YYYY-MM-DD` tails from social descriptions.
*
* @param value - Raw description candidate
* @returns Description with trailing publication-date boilerplate removed
*/
function stripPublishedDateTail(value: string): string {
Iif (!value) return '';
const withoutTail = value.replace(PUBLISHED_DATE_TAIL_RE, '');
return trimTrailingSeparators(withoutTail).trim();
}
/**
* Resolve a publish-date-safe description: prefer the stripped value, and
* only fall back to the original when no `Published …` tail was present.
* When the original was *only* a publish-date tail, stripping yields an
* empty string and we must not re-introduce the leaked tail.
*
* @param value - Raw description candidate
* @returns Stripped description, or empty when the original was tail-only
*/
function safeDescriptionWithoutPublishedTail(value: string): string {
const stripped = stripPublishedDateTail(value);
Eif (stripped) return stripped;
return PUBLISHED_DATE_TAIL_RE.test(value) ? '' : value;
}
/**
* Strip numbered list prefixes from JSON-LD mention labels.
*
* @param name - Raw mention label
* @returns Mention label without leading numeric hierarchy markers
*/
function sanitizeMentionName(name: string): string {
let cleaned = name.trim();
while (/^\d+\./u.test(cleaned)) {
cleaned = cleaned.replace(/^\d+\./u, '').trimStart();
}
cleaned = cleaned.replace(/^\d+\s+/u, '').replace(/^\.\s*/u, '');
return cleaned.trim();
}
/**
* Compute the per-surface SEO-budget-clamped variants of the article
* title and description for a single render. See
* `analysis/methodologies/seo-headers-policy.md` § 1.1 for the
* documented sources of every cap.
*
* @param options - The {@link WrapArticleOptions} carrying title /
* description / extendedDescription
* @param lang - Validated publishing locale (already coerced to a
* supported `LanguageCode`)
* @param siteTitle - Resolved localized site title used as the brand
* suffix
* @returns One {@link SeoClampedSurfaces} record per article render
*/
function computeSeoClamps(
options: WrapArticleOptions,
lang: LanguageCode,
siteTitle: string
): SeoClampedSurfaces {
const safeMetaDescription = safeDescriptionWithoutPublishedTail(options.description);
const pageTitle = buildPageTitle(options.title, lang, siteTitle);
const ogTitleClamped = clampForBudget(options.title, lang, 'ogTitle');
const twitterTitleClamped = clampForBudget(options.title, lang, 'twitterTitle');
const metaDescriptionClamped = clampForBudget(safeMetaDescription, lang, 'metaDescription');
// og:description and twitter:description prefer the longer BLUF
// paragraph (extendedDescription) so social-card previews show the
// full lede; fall back to the short meta description when the
// extended one is empty.
const socialSourceRaw =
options.extendedDescription && options.extendedDescription.length > 0
? options.extendedDescription
: safeMetaDescription;
const socialSource = stripPublishedDateTail(socialSourceRaw) || safeMetaDescription;
const ogDescriptionClamped = clampForBudget(socialSource, lang, 'ogDescription');
const twitterDescriptionClamped = clampForBudget(socialSource, lang, 'twitterDescription');
const imageAltClamped = clampForBudget(
`${options.title}${getTitleSeparator(lang)}${siteTitle}`,
lang,
'imageAlt'
);
const jsonLdHeadline = truncateHeadline(options.title);
// Emit an `alternativeHeadline` whenever the headline truncator
// dropped more than a handful of characters from the full title.
// Schema.org's `NewsArticle.alternativeHeadline` field is exactly
// for the long-form variant of `headline` and lets Google's
// Knowledge Graph keep both versions for retrieval. The 5-char
// threshold avoids emitting trivially redundant pairs when the
// truncator only trimmed trailing whitespace or punctuation.
const fullTitleTrimmed = options.title.trim();
const altCandidate =
fullTitleTrimmed.length - jsonLdHeadline.length > 5 ? fullTitleTrimmed : undefined;
return {
pageTitle,
ogTitleClamped,
twitterTitleClamped,
metaDescriptionClamped,
ogDescriptionClamped,
twitterDescriptionClamped,
imageAltClamped,
jsonLdHeadline,
...(altCandidate ? { alternativeHeadline: altCandidate } : {}),
};
}
/**
* Render the full article HTML document with the shared chrome.
*
* @param options - {@link WrapArticleOptions} describing the article and its
* rendered body content
* @returns Complete `<!DOCTYPE html>` document ready to be written to disk
*/
export function wrapArticleHtml(options: WrapArticleOptions): string {
const safeLang = ALL_LANGUAGES.includes(options.lang) ? options.lang : ('en' as LanguageCode);
const dir = getTextDirection(safeLang);
const siteTitle = getLocalizedString(PAGE_TITLES, safeLang).split(' - ')[0] ?? SITE_NAME;
const skipLinkText = getLocalizedString(SKIP_LINK_TEXTS, safeLang);
const canonicalUrl = `${BASE_URL}/news/${getArticleFilename(options.articleSlug, safeLang)}`;
const indexHref = safeLang === 'en' ? '../index.html' : `../index-${safeLang}.html`;
const hreflangLinks = buildArticleHreflangLinks(options.articleSlug);
const langSwitcher = buildLanguageSwitcher(options.articleSlug, safeLang);
const sourceMdLabel = getLocalizedString(VIEW_SOURCE_MARKDOWN_LABELS, safeLang);
const articleNavLabel = getLocalizedString(ARTICLE_NAV_LABELS, safeLang);
const backToNewsLabel = getLocalizedString(BACK_TO_NEWS_LABELS, safeLang);
const politicalIntelligenceLabel = getLocalizedString(
FOOTER_POLITICAL_INTELLIGENCE_LABELS,
safeLang
);
const sitemapLabel = getLocalizedString(FOOTER_SITEMAP_LABELS, safeLang);
const politicalIntelligenceHref = `../${getPoliticalIntelligenceFilename(safeLang)}`;
const sitemapHref = `../${getSitemapFilename(safeLang)}`;
const sourceMdHref = options.sourceMarkdownRelPath ? blobUrl(options.sourceMarkdownRelPath) : '';
const sourceMdLink = options.sourceMarkdownRelPath
? `<p class="article-source-md"><a href="${escapeHTML(sourceMdHref)}" rel="alternate" type="text/markdown"><svg class="icon icon-inline" width="16" height="16" viewBox="0 0 24 24" role="img" aria-hidden="true" focusable="false"><path d="M9 5H7a2 2 0 0 0-2 2v10a2 2 0 0 0 2 2h10a2 2 0 0 0 2-2v-2M12 3h6a2 2 0 0 1 2 2v6M10 14 20 4" fill="none" stroke="currentColor" stroke-width="1.8" stroke-linecap="round" stroke-linejoin="round"/></svg> ${escapeHTML(sourceMdLabel)}</a></p>`
: '';
const tocHtml = buildArticleToc(options.toc ?? [], safeLang);
const articleMainClass = tocHtml.length > 0 ? 'article-main--with-toc' : 'article-main--no-toc';
const articleSectionLabel = getLocalizedArticleTypePlain(options.articleType, safeLang);
const disclosureBody = buildProgressiveDisclosureBody(options.body, safeLang);
const transformedBodyHtml =
options.readerFriendly === false
? disclosureBody.bodyHtml
: applyReaderFriendlyTransform(disclosureBody.bodyHtml);
// Count words from the rendered body for the JSON-LD `wordCount`
// field (Google's NewsArticle structured-data validator emits a
// warning when this is missing). Done by stripping HTML tags from
// the rendered body then splitting on whitespace — fast and
// CodeQL-safe.
const wordCount =
disclosureBody.wordCounts.quick +
disclosureBody.wordCounts.analysis +
disclosureBody.wordCounts.intelligence;
const readingTimes = options.readingTimes ?? buildLayerReadingTimes(disclosureBody.wordCounts);
const disclosureLabels = getLocalizedString(PROGRESSIVE_DISCLOSURE_LABELS, safeLang);
const min = disclosureLabels.minutesAbbr;
const readingTimeLine = `⏱️ ${disclosureLabels.quickRead}: ${readingTimes.quickRead}${min} · ${disclosureLabels.fullAnalysis}: ${readingTimes.fullAnalysis}${min} · ${disclosureLabels.completeIntelligence}: ${readingTimes.completeIntelligence}${min}`;
// Pre-compute the per-surface SEO-budget-clamped variants of title
// and description. Each surface gets its own clamp tuned to the
// documented platform envelope (Google/Bing SERP, Facebook/LinkedIn
// OG, Twitter card) and the script family (Latin / CJK / RTL —
// CJK glyphs render at ~2× Latin pixel width, so the same byte
// count occupies twice the SERP width). See
// `src/aggregator/metadata/seo-budgets.ts` for the budget table and
// `analysis/methodologies/seo-headers-policy.md` § 1.1 for the
// documented sources of every cap.
const seoClamps = computeSeoClamps(options, safeLang, siteTitle);
const {
pageTitle,
ogTitleClamped,
twitterTitleClamped,
metaDescriptionClamped,
ogDescriptionClamped,
twitterDescriptionClamped,
imageAltClamped,
jsonLdHeadline,
alternativeHeadline,
} = seoClamps;
// Build the JSON-LD image graph. Google requires NewsArticle.image
// to be an array (or single ImageObject) with explicit width/height
// covering at least one of the 1:1, 4:3, 16:9 aspect ratios for
// Top Stories carousel eligibility.
const jsonLdImages = [
{
'@type': 'ImageObject',
url: `${BASE_URL}/images/og-image-1200.jpg`,
width: 1200,
height: 630,
},
{
'@type': 'ImageObject',
url: `${BASE_URL}/images/og-image-1200.webp`,
width: 1200,
height: 630,
},
{
'@type': 'ImageObject',
url: `${BASE_URL}/images/og-image-1200.avif`,
width: 1200,
height: 630,
},
];
const sanitizedMentions = (options.mentions ?? [])
.map((name) => sanitizeMentionName(name))
.filter(Boolean);
const jsonLd = {
'@context': 'https://schema.org',
'@type': 'NewsArticle',
headline: jsonLdHeadline,
...(alternativeHeadline ? { alternativeHeadline } : {}),
description: metaDescriptionClamped,
datePublished: options.date,
dateModified: options.date,
inLanguage: safeLang,
url: canonicalUrl,
mainEntityOfPage: { '@type': 'WebPage', '@id': canonicalUrl },
image: jsonLdImages,
author: {
'@type': 'NewsMediaOrganization',
name: PUBLISHER_NAME,
url: 'https://hack23.com',
sameAs: [...ORG_SAME_AS],
},
publisher: {
'@type': 'NewsMediaOrganization',
name: PUBLISHER_NAME,
url: 'https://hack23.com',
logo: { '@type': 'ImageObject', url: `${BASE_URL}/images/apple-touch-icon.png` },
sameAs: [...ORG_SAME_AS],
},
articleSection: articleSectionLabel,
wordCount,
keywords: (options.keywords ?? []).join(', '),
speakable: {
'@type': 'SpeakableSpecification',
cssSelector: ['.article-dek', '.article-body > p:first-of-type'],
},
isPartOf: {
'@type': 'WebSite',
name: SITE_NAME,
url: BASE_URL,
},
...(options.isBasedOn && options.isBasedOn.length > 0
? {
isBasedOn: options.isBasedOn.map((url) => ({ '@type': 'CreativeWork', url })),
}
: {}),
...(sanitizedMentions.length > 0
? {
mentions: sanitizedMentions.map((name) => ({
'@type': 'Organization',
name,
})),
}
: {}),
};
const breadcrumbLd = {
'@context': 'https://schema.org',
'@type': 'BreadcrumbList',
itemListElement: [
{
'@type': 'ListItem',
position: 1,
name: SITE_NAME,
item: BASE_URL,
},
{
'@type': 'ListItem',
position: 2,
name: articleSectionLabel,
item: `${BASE_URL}/news/`,
},
{
'@type': 'ListItem',
position: 3,
name: options.title,
item: canonicalUrl,
},
],
};
const structuredData = [jsonLd, breadcrumbLd];
const jsonLdString = JSON.stringify(structuredData).replace(/</g, '\\u003c');
const keywords = (options.keywords ?? []).map((keyword) => keyword.trim()).filter(Boolean);
const keywordsMeta =
keywords.length > 0
? ` <meta name="keywords" content="${escapeHTML(keywords.join(', '))}">\n`
: '';
const ogLocaleTags = buildOgLocaleTags(safeLang);
const twitterAttribution = buildTwitterAttributionTags();
const twitterAttributionBlock = twitterAttribution ? `\n${twitterAttribution}` : '';
const header = buildSiteHeader({
lang: safeLang,
pathPrefix: '../',
homeHref: indexHref,
siteTitle,
languageSwitcherHtml: langSwitcher,
});
return `<!DOCTYPE html>
<html lang="${safeLang}" dir="${dir}">
<head>
<meta charset="UTF-8">
<meta name="viewport" content="width=device-width, initial-scale=1.0">
<meta http-equiv="X-Content-Type-Options" content="nosniff">
<meta http-equiv="Content-Language" content="${safeLang}">
<meta name="referrer" content="no-referrer">
<title>${escapeHTML(pageTitle)}</title>
<meta name="description" content="${escapeHTML(metaDescriptionClamped)}">
${keywordsMeta} <meta name="robots" content="index, follow, max-snippet:-1, max-image-preview:large">
<meta name="author" content="${PUBLISHER_NAME}">
<meta name="publisher" content="${PUBLISHER_NAME}">
<meta name="date" content="${options.date}">
<meta property="article:published_time" content="${options.date}">
<meta property="article:modified_time" content="${options.date}">
<meta property="article:section" content="${escapeHTML(articleSectionLabel)}">
<meta property="article:author" content="${PUBLISHER_NAME}">
<meta property="article:publisher" content="https://hack23.com">
<link rel="canonical" href="${canonicalUrl}">
${hreflangLinks}
${buildRssAlternateLink(safeLang, `${BASE_URL}/`)}
<link rel="preconnect" href="https://hack23.com" crossorigin>
<meta property="og:type" content="article">
<meta property="og:title" content="${escapeHTML(ogTitleClamped)}">
<meta property="og:description" content="${escapeHTML(ogDescriptionClamped)}">
<meta property="og:url" content="${canonicalUrl}">
<meta property="og:site_name" content="EU Parliament Monitor">
${ogLocaleTags}
${buildResponsiveSocialImageMeta(imageAltClamped)}
<meta name="twitter:card" content="summary_large_image">
<meta name="twitter:title" content="${escapeHTML(twitterTitleClamped)}">
<meta name="twitter:description" content="${escapeHTML(twitterDescriptionClamped)}">${twitterAttributionBlock}
${buildResponsiveIconLinks('../')}
<link rel="manifest" href="../site.webmanifest">
<meta name="color-scheme" content="light dark">
<meta name="theme-color" content="#003399" media="(prefers-color-scheme: light)">
<meta name="theme-color" content="#0a1a38" media="(prefers-color-scheme: dark)">
<link rel="stylesheet" href="../styles.css?v=${BUILD_SHORT}">
${buildHeadFreshnessTags('../')}
<script type="application/ld+json">${jsonLdString}</script>
<script type="module" src="../js/mermaid-init.js?v=${MERMAID_VERSION}" defer></script>
<script src="../js/article-runtime.js" defer></script>
</head>
<body>
<a href="#main" class="skip-link">${escapeHTML(skipLinkText)}</a>
<div class="reading-progress" aria-hidden="true"></div>
${header}
${buildPageBanner('../')}
<main id="main" class="site-main article-main ${articleMainClass}">
<nav class="article-top-nav" aria-label="${escapeHTML(articleNavLabel)}">
<a class="article-top-nav__link article-top-nav__link--primary" href="${indexHref}">${escapeHTML(backToNewsLabel)}</a>
<a class="article-top-nav__link" href="${politicalIntelligenceHref}">🧠 ${escapeHTML(politicalIntelligenceLabel)}</a>
<a class="article-top-nav__link" href="${sitemapHref}">🗺️ ${escapeHTML(sitemapLabel)}</a>
</nav>
${tocHtml} <article class="article-body" lang="${safeLang}">
<header class="article-hero">
<p class="article-kicker">${escapeHTML(getLocalizedArticleType(options.articleType, safeLang))}</p>
<h1>${escapeHTML(options.title)}</h1>
<p class="article-dek">${escapeHTML(options.description)}</p>
<p class="article-reading-times" aria-label="${escapeHTML(disclosureLabels.readingTimeAria)}">${escapeHTML(readingTimeLine)}</p>
<p class="article-meta"><time datetime="${options.date}">${options.date}</time> · EU Parliament Monitor</p>
</header>
${sourceMdLink}
${transformedBodyHtml}
</article>
</main>
${buildSiteFooter({ lang: safeLang, pathPrefix: '../', ...(typeof options.articleCount === 'number' ? { articleCount: options.articleCount } : {}) })}
</body>
</html>`;
}
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